Refactor modules, closes #223

* All modules are sandboxed now
* All images,sounds,fonts,translations and styles were moved to "data" folder
* Reorganize image files folders
* Remove unmaintained modules: client_particles, client_shaders
* Implement new automatic way to load styles and fonts
* Add hide/show offline option in VipList
* Add invite/exclude to/from private channel in players menus
* Many other minor changes

data/styles/10-checkboxes.otui

@@ -0,0 +1,66 @@
+CheckBox < UICheckBox
+  size: 16 16
+  text-align: left
+  text: aa
+  text-offset: 16 0
+  color: #aaaaaa
+  image-color: #ffffffff
+  image-rect: 0 0 12 12
+  image-offset: 0 2
+  image-source: /images/ui/checkbox
+
+  $hover !disabled:
+    color: #cccccc
+
+  $!checked:
+    image-clip: 0 0 12 12
+
+  $hover !checked:
+    image-clip: 0 12 12 12
+
+  $checked:
+    image-clip: 0 24 12 12
+
+  $hover checked:
+    image-clip: 0 36 12 12
+
+  $disabled:
+    image-color: #ffffff88
+    color: #aaaaaa88
+
+ColorBox < UICheckBox
+  size: 16 16
+  image-color: #ffffffff
+  image-source: /images/ui/colorbox
+
+  $checked:
+    image-clip: 16 0 16 16
+
+  $!checked:
+    image-clip: 0 0 16 16
+
+ButtonBox < UICheckBox
+  font: verdana-11px-antialised
+  color: #ffffffff
+  size: 106 22
+  text-offset: 0 0
+  text-align: center
+  image-source: /images/ui/tabbutton_rounded
+  image-color: white
+  image-clip: 0 0 20 20
+  image-border: 2
+
+  $hover !disabled:
+    image-clip: 0 20 20 20
+
+  $checked:
+    image-clip: 0 40 20 20
+    color: #80c7f8
+
+  $disabled:
+    color: #666666ff
+    image-color: #ffffff88
+
+ButtonBoxRounded < ButtonBox
+  image-source: /images/ui/tabbutton_rounded
+  image-border: 2